For recon I've been thinking floating flowers that those with a Life boon can use to see out of. Like UAVs, but biological.
As for greenskin converts, it's unlikely to happen. Grummugga being the only god of orcs shows a enormous amount of sway over their thoughts and feelings. As for the goblins, if the don't follow Grum they have their own god or goddess.
If they do convert, tell them to kneel down, throw their weapons out of reach, and cross their arms across their chest. They'll hold that position until the battle is over. Then Tiberious and Laskus can round them up and we can figure out how to tell how honestly they converted.
As for the Justicars we captured, if we have time we should check in and see how they're doing. Ask them about their god, try to make it clear that we don't bear them any ill will, we simply defended our people. Perhaps put a minor enchantment to see if their god shows up so we can talk to him. After all, we don't want to be enemies, this was a misunderstanding. If he's worried about his control over magi, we'd be happy to take them off his hands.
Ravenholt should be saved as well. We need to check on the situation there, though. We have much to deal with right now and we need to judge how pressing each issue is. The siege can probably wait a bit. Uristiel told us supplies were running low, not out. We should have at least a day left before any problems arise on that front.